The end bearing housing closes the trough of a screw conveyor, supports the conveyor shaft bearing and provides the sealing arrangement that keeps product out of the bearing and lubricant out of the product. It has to stay aligned with the shaft while the trough expands, sees fine abrasive dust on every surface and often needs to be dismantled quickly in a plant with limited access. We cast the housing rather than fabricate it because the bearing pocket, seal bore, trough flange and bolt bosses intersect at awkward angles that are far cheaper to integrate into a casting, then machine those features to a shared datum so the bearing and shaft stay aligned.
Specifications
| Item | Specification |
|---|---|
| Part name | Screw conveyor end bearing housing |
| Typical size range | Shaft bore 30–250 mm, flange size to 600 mm square, 5–120 kg finished weight |
| Casting process | Resin-bonded sand casting for standard sizes; investment casting for compact housings with thin walls and close-cored passages |
| Materials | Ductile iron QT450-10 and 500-7, alloy steel 42CrMo4 for high load or welded-in installations, stainless grades available on request for food and chemical duty |
| Heat treatment | Stress relieving anneal for ductile iron housings before machining; quench and temper for 42CrMo4; solution treatment and water quench for stainless variants |
| Casting tolerance | ISO 8062 CT6–CT8 depending on overall casting size |
| Machining | CNC machining centre: bearing pocket and bore, seal bore, shaft clearance bore, trough flange face, bolt holes, grease or oil ports, split-line faces for two-piece housings |
| Machining tolerance | Bearing pocket to H7 or drawing; shaft bore concentric with bearing pocket within 0.05 mm |
| Surface finish | Ra 1.6–3.2 µm on bearing pocket and seal bore; Ra 6.3 µm on external faces unless painted finish is specified |
| Hardness | Ductile iron 160–220 HB; 42CrMo4 quenched and tempered to 260–320 HB |
| Pressure test | Grease and oil galleries pressure tested to drawing requirement where cast or drilled passages are specified |
| NDT | Dye penetrant or magnetic particle inspection on machined sealing faces; ultrasonic testing available for thick boss sections |
| Documentation | EN 10204 3.1 certificate, hardness report, heat treatment chart, dimensional report with seal arrangement verification, FAI and PPAP level 3 |
| Production volume | Prototype through to series supply for conveyor OEMs and replacement programmes |
Key features
- Bearing pocket, seal bore and shaft clearance machined from one clamping so the shaft runs concentric with the bearing and the seal sits square on the shaft.
- Split-line option lets maintenance staff replace the bearing without pulling the conveyor shaft, saving hours on every service event.
- Cast-in bosses and ribs stiffen the flange so the housing does not distort when the trough bolts are torqued down.
- Ductile iron QT450-10 absorbs the vibration of long conveyor runs better than fabricated steel housings and machines cleanly.
- Seal arrangements prepared for lip seals, packed glands or air-purged seals according to your specification.
- Oil or grease ports drilled, deburred and plugged before shipment so no swarf enters the bearing pocket.
Applications
- Trough and tubular screw conveyors in bulk material handling plants.
- Hanger and end bearings for cement, fly ash and lime conveyors.
- Grain, feed and flour screw conveyors in agriculture and food processing.
- Wood chip, biomass and waste handling conveyors.
- OEM screw conveyor assemblies and aftermarket spare programmes.
Quality and compliance
All end bearing housings are produced within the IATF 16949 certified quality system operated by Ningbo Ruican, with foundry parameters, heat treatment batches and inspection results recorded against each part number. First article inspection verifies the relationship between bearing pocket, seal bore and shaft clearance with a CMM report, and PPAP level 3 documentation is submitted for series orders. Each delivery is supported by an EN 10204 3.1 certificate giving chemical analysis and mechanical properties for the heat used, hardness test reports taken on the actual casting, and NDT reports covering penetrant or magnetic particle examination of the machined sealing faces. Where the drawing specifies pressure testing of lubrication galleries, the test record is supplied with the part.
FAQ
Can you machine the housing for our preferred seal arrangement?
Yes. We machine for lip seals, packed glands, felt seals or air-purged arrangements, working to your seal supplier drawing so the seal seats correctly on its bore and shaft diameter.
Do you offer split housings for easier maintenance?
We do. Two-piece housings are cast with a machined split line and dowelled cap, so bearings can be replaced without removing the conveyor shaft. Tell us the split line orientation you need.
Which material suits abrasive cement dust?
Ductile iron QT450-10 handles this duty well and machines to a good seal surface finish. For higher loads or where the housing is welded into the trough structure, 42CrMo4 gives the required strength and weldability.
How do you keep swarf out of the bearing pocket?
Cleaning and deburring follow machining, then every port is plugged and the pocket is inspected before packing. Export packing uses sealed crates so contamination cannot enter during transit.
Can you supply the housing complete with bearing and seals?
Yes, many customers take the fully assembled unit. We fit the bearing and seals you specify, set the shaft clearance to your requirement and ship the assembly ready to bolt on.
Talk to our engineering team
Ningbo Ruican supplies build-to-print castings and CNC machined components for crushing, conveying and bulk material handling equipment, with pattern making, foundry, heat treatment, machining and inspection in one IATF 16949 certified plant. Send drawings, samples or rough sketches and we will return a manufacturability review with a quotation.
- Contact: Wendy She
- Email: sales@cnsandcasting.com
- WhatsApp: +86-13777124360
- Website: https://cnsandcasting.com
CTA
Need a quote for Screw conveyor end bearing housing? Send your drawing to sales@cnsandcasting.com or WhatsApp +86 137 7712 4360 for a fast RFQ response from Ningbo Ruican.
